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Demo viewsheds
Interactive viewshed map for validation viewshed in Cobar NSW
Comparing viewscape::compute_viewshed() which does not implement Earth curvature or atmospheric refraction compensation, and terra::viewshed() which does.
Mythical 48m high tower viewpoint.
Consider this article
https://www.sciencedirect.com/science/article/pii/S016920462200072X